与ExecutorService同时运行多个线程但只执行了一些

Question

我有一个应用程序基本上会使用ExecutorService同时运行多个线程，但不知何故它只执行了其中一些。在这个例子中，我将30个任务提交给10个线程的池，但它只执行了大约20个任务。我的代码有什么问题吗？

我已经把一些睡眠时间等待，但仍然没有更好的运气。我应该将它作为ScheduledThreadPool运行吗？

以下是我的代码：

        ExecutorService executor = Executors.newFixedThreadPool(10);
    for(int i =0;i<30;i++) {
        Faker faker = new Faker();
        String firstName = faker.name().lastName(); 
        RunningThread run = new RunningThread(firstName.toLowerCase(), s3, gcs, amazonIam, googleIAM, false, projectName, 1);
        System.out.println("run thread "+ i);
        executor.submit(run);
    }
    executor.shutdown();
    while (!executor.isTerminated()) {

    }
    System.out.println("\nFinished all threads");

这是Thread实现：

public class RunningThread implements Runnable {
    String name;
    AmazonS3 s3 ;
    Storage gcs;
    AmazonIdentityManagement amazonIam ;
    Iam googleIAM ;
    boolean companyReg;
    String projectName;
    int employeeType;

 public RunningThread(  String name, AmazonS3 s3, Storage gcs,  AmazonIdentityManagement amazonIam, Iam googleIAM, boolean companyReg, String projectName, int employeeType) {
        this.projectName = projectName;
        this.name = name;
        this.s3 =s3;
        this.gcs = gcs;
        this.amazonIam = amazonIam;
        this.googleIAM = googleIAM;
        this.employeeType = employeeType;
        this.companyReg = companyReg;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        long duration = 0;

        try {
            //          long start = System.currentTimeMillis();
            if(companyReg == true) {
                Thread.sleep(2000);
                duration = MainApplication.registerCompany(s3, gcs, amazonIam, googleIAM, name, projectName);
                }else {
                Thread.sleep(2000);
                duration = MainApplication.registerNewCfBEmployee(s3, gcs, amazonIam, googleIAM, name, projectName, employeeType);
            }
            MainApplication.duration.add(duration);
            System.out.println(duration);
            Thread.sleep(30000);

        } catch (IOException | GeneralSecurityException | InterruptedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        }
    }

有什么建议吗？